ive never driven a car with a t4 but as tabetha said, a turbo of that size
i wouldnt expect to come onto boost till 4000rpm+
may even have a faulty actuator that letting the wastegate open
and bleeding of exhaust gases before she spools.
its not recommended but take the vacum line of the actuator go for a thrash an see if it spools up, but keep an eye on ya boost gauge at the sametime.